Single Row Deep Groove Ball Bearing Problem

Single Row Deep Groove Ball Bearing Problem

PROBLEM

Select a single row deep groove ball bearing with the operating cycle listed below, which will have a life of 15000 hours.

Fraction of cycleType of loadRadial (N)Thrust (N)Speed (RPM)Service factor
1/10Heavy shocks200012004003
1/10Light shocks150010005001.5
1/5Moderate shocks100015006002
3/5No shock120020008001

Assume:

Inner race rotates

Radial load factor = 1.0

Axial load factor = 1.5

Rotational factor of the bearing = 1

SOLUTION

Basic dynamic equivalent radial load,

By considering the radial factors,

Since the rotational factor (V) for most of the bearings is 1, let’s take V=1,

Life of the bearing for fraction of cycles (FC),

So, the equivalent dynamic load,

So, the dynamic load rating,